I am wondering, how often does it happen that Grand Cayman is missed because of rough seas? A co-worker jsut got back from a 14 day cruise and she said they couldn't stop there because of rough seas. They were ont he Veendam, so it is a smaller ship. Does ship size make a difference, or are rough seas bad enough to cancel ALL ships for that day?

I'll be there in February and I DO NOT want to miss Grand Cayman, which is the sole reason we are doing this route again. We didn't have enough time to see everything, or shop, in January so we decided to go back, but leave out of Galveston on the Conquest. I wanted Freedom, but my mother didn't want to go out of Miami again because it takes so long to get there (10 hours, vs the 7-8 to get to Galgeston).

There's not much of a way to predict or determine when you may miss Grand Cayman. The first 6-7 times we were there we never had a problem. Then the next two times we were there, ( in sept. and again in jan. ) we missed the port due to rough seas. But have been back there twice since and had no problem. Odds are in your favor but be aware that on ocassion ships have to cancel that port.
It doesn't have to be rainy or stormy either-- nor does ship size have a bearing. One of the times we missed it we were on the Mariner of the Seas, which is big by any standards.
Safety has to come first in all cases.
As said, odds are with you that you will be fine.